What is the Difference Between Sociopathy and Psychopathy?

In the previous post on the possible rise of male sociopathy here, reader Gawains Ghost says he is not sure he knows exactly what sociopathy is. He is in good company. People seem to use a number of psychological terms interchangeably and it often gets a bit confusing.

"suggests that the difference between sociopathy and psychopathy may primarily reflect how the person using these terms views the factors contributing to the antisocial disorder." More apt to view antisocial behavior as arising from social conflicts, sociologists typically prefer the term sociopath. Whereas, psychologists use the term psychopathy to describe a psychological disorder that is the product of a combination of psychological, biological, genetic and environmental factors (Hare 1999).

To make it a bit more confusing, psychologists use the term Antisocial Personality Disorder from the DSM-5 to describe some of the traits of the psychopath though it is important to remember that one can have APD without being a sociopath or psychopath.